The 23-year-old is expected to move to Humberside within the next 24 hours after failing to make the grade at Manchester United.
Keane has previously worked with Hull caretaker manager Mike Phelan when the current Hull boss was assistant manager at Manchester United under Alex Ferguson.
Hull finally made their first signing of the summer today in former Cardiff City goalkeeper David Marshall and Phelan's side are hoping to bring in more faces before the deadline tomorrow.